package demo4.mapper;

import demo4.pojo.User;
import demo4.util.IDBUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

@Component
public class Usermapper implements IUserMapper{

    @Autowired
    private IDBUtil idbUtil;



    public int insert(User user)
    {
        //System.out.println("UserMapper:向user表中插入用户数据....");
        try (Connection connection = idbUtil.getConnection()){
            String sql = "insert into user(username,password,nickname,age) " +
                         "values(?,?,?,?) ";

            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,user.getUsername());
            ps.setString(2,user.getPassword());
            ps.setString(3,user.getNickname());
            ps.setInt(4,user.getAge());
            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //System.out.println("UserMapper:执行Insert操作");
        //System.out.println("UserMapper:执行完毕，返会影响的条目数");
        return 0;
    }
    public User selectByUsername(String username){
        try (Connection connection = idbUtil.getConnection();){
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM user " +
                         "WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, username);
            ResultSet rs = ps.executeQuery();
            if (rs.next()){
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                return user;
            }

        } catch (SQLException e) {
            e.printStackTrace();

        }
        return null;
    }

    public List<User> selectAll(){
        List< User> users = new ArrayList<>();
        try (Connection connection = idbUtil.getConnection()){
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM user";
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()){
                User user = new User();
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                users.add(user);

            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return users;
    }

    public int update(User user){
        try (Connection connection = idbUtil.getConnection()){
            String sql = "update user " +
                    "set password=?,nickname=?,age=? " +
                    "where username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,user.getPassword());
            ps.setString(2,user.getNickname());
            ps.setInt(3,user.getAge());
            ps.setString(4,user.getUsername());

            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
}
